test: reduce flakiness of test-runner-output

PR-URL: #51952
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/fixtures/test-runner/output/describe_it.js

@@ -302,12 +302,18 @@ describe('describe async throw fails', async () => {
 describe('timeouts', () => {
   it('timed out async test', { timeout: 5 }, async () => {
     return new Promise((resolve) => {
-      setTimeout(resolve, 100);
+      setTimeout(() => {
+        // Empty timer so the process doesn't exit before the timeout triggers.
+      }, 5);
+      setTimeout(resolve, 30_000_000).unref();
     });
   });
 
   it('timed out callback test', { timeout: 5 }, (t, done) => {
-    setTimeout(done, 100);
+    setTimeout(() => {
+        // Empty timer so the process doesn't exit before the timeout triggers.
+    }, 5);
+    setTimeout(done, 30_000_000).unref();
   });